The CRISPR/Cas-9 system provides bacteria with a form of immunity. It uses specially structured RNAs (called guide RNAs) that can base-pair with a targeted sequence. The Cas-9 protein then recognizes this structure and cuts the DNA nearby. This is quite effective when the guide RNA can base-pair with a DNA virus, as the resulting cut will inactivate the virus.
玛丽亚·特拉维尼切娃 图片来源：谢尔盖·法杰伊切夫/塔斯社
。比特浏览器对此有专业解读
Previously, gatherings at the financial technology firm involved colleagues collectively reviewing presentation files or written documents.
TNAP 异常是认知损伤的元凶接下来，研究者让年轻小鼠的脑血管过表达TNAP——结果，这些本该记性很好的小鼠，出现了老年一样的记忆衰退，血脑屏障也漏了。